Door knocker



J. sTARP DooR KNocKER FiledApl-il '7. 1949 sept. 19, 195o JNVENTOR.Jnlnn farlo vw-u Anya.

Patented Sept. 19, 1950 UNITED STATES PAT-.ENT 'OFFICE 2,523,158 y iDooRKNooKEn lJohn AStarp, `Cleveland Heights, Dho Application April 7,laia'seriai No.sacvs 1 claim. (o1. 11s- 172) Y A the upper threadedportion of the hollow block, ofthis application vis a door knockermounted on Vvand is provided with la seat 22 against `which the a uniquebase plate forming a part thereof. transverse pin engages'and whichlimits the up- Myiinvention has for itsobject to provide an `wardmovement 4of the plunger in the'cap and .-.lmpro-.vedeoor knocker whichis particularly 4also in the hollow block.y u.

simple and economical in construction, and vThe plunger is provided witha knob 23,\which `highly efficient and durable in use; and to this isdetachably threaded on the upper end of the end, it consists in thenovel combinations and stem of the plunger.

means hereinafter set forth and claimed. It has been previously notedthat the hollow In describing this invention, reference is had l0 bloc-kprojects slightly below the bottom surface to the accompanying drawingin which like charof the base plate, so that when it is mounted onacters designate corresponding parts in all the the door or the like,the two lower screws used views. p to assist in holding it in place, andfor which Figure l is a view in elevation of the base plate the twothrough holes 24 and 25 are provided ."A'Ihe'invention constituting thesubject matter with the door knocker mounted therein. therein causes thehollow block to be firmly held against the surface of the door. When theplunger is given a quick stroke with the hand, According to my inventionI emploi7 a base the end of the plunger contacting the upper surplate orsupport I made of cast metal, plastic or face of the upstanding portionin the hollow block other suitable material. In the base plate thereimparts a knock that is very intense and free may be provided threerecesses as at 2, 3 and 4. from rattle. The recess 4 is provided toaccommodate a scratch The operation of the device is as follows: pad,while the recesses 2 and 3 are provided to The base plate with itsassembled knocker receive and hold the number of a house or a suitetherein is screwed in place 0n a 1001' 0I' the likeand the name of theoccupant thereof. The When it is necessary `to use the knocker, thescratch pad may be held in place by means of the knob thereof is given asharp stroke with the bolts and nuts 5 and 5, however, any othersuithand which drives the plunger down in the holable practical meansmay be used. low block against the upstanding portion in the In the baseplate there is removably mounted bottom thereof which imparts an intensesound. a hollow block 1 having a smooth blind bore 8 m When the hand isremoved the C011 spring beine therein, in the bottom of which there isprovided of the expansible type causes the plunger to a raised portion 9against which the enlarged return to its initial position. Its upwardmovehead of the plunger strikes. The block is proi ment is limited bythe seat in the cap. If the vided with an annular flange In, an upperspring becomes exhausted, a new Spring may be 4 threaded portion ll, anda lower threaded por- 35 easily inStalled by removing the knOb IOm thetion I2, that extends through the base plate and I plunger and the capfrom the hollow block and slightly below the lower surface I3 of thebase the transverse pin in the Stem 0f the plunger. plate. The hollowblock is held in assembled rela- A new spring may then be installed andthe parts tionship in the base plate by means of a speed assembled. nutI4 or the like that clamps the plate between 40 While I have shown anddescribed a preferred the underside of the flange and the uppersurarrangement, it will be readily understood that face of the speednut. changes and modications therein may be found In the hollow blockthere is provided a plunger desirable or essential in meeting thevarious exi- I5 with a stem I6 and an enlarged head I1 gencies of use,and I desire to be understood as adapted to engage the raised portion 9in the 45 reserving the right to make any and al1 such hollow block whenmanually knocked down therechanges or modications as may be founddeagainst. On the stem of the plunger there is sirable or essential, inso far as the same may fall mounted a Washer I8 and a helical springfIQ.within the spirit and scope of the invention as In the stem there isprovided a transverse removexpressed in the accompanying claim when ably,mounted pin 20. The helical spring is disbroadly construed. posedbetween the pin and the washer. The Having thus described my invention,what I helical spring is of the expansible type and norclaim is: mallyholds the plunger in the position shown in A door knocker, comprising,in combination, the sectional view in Figure 2. a hollow base memberhaving a through open- A detachably mounted cap 2l is threaded on 55 ingtherein intermediate its width and adjacent Figure 2 is a sectional Viewon line 2--2 in Fig. l.

one end thereof, a hollow cylindrical knocker member having a smoothinternal bore therein, and an upstanding plunger engaging portion in thebottom thereof, and also having an upper externally threaded portion anda lower externally threaded portion, a flange between the aforesaidthreaded portions, the lower portion mounted in the through opening inthe base and positioned by the flange engaging the upper surface of thehollow base member so that the end of the lower threaded portion extendsslightly below the bottom surface of the base member, a nut threadedonto the lower threaded portion and adapted to secure the knocker memberin the base member, a plunger having a Vstem portion slidably mounted inthe knocker member, a washer slidably mounted on the plunger stem andseated on the upper end of the knockerA member, a helical spring mountedon the plunger stem, its lower end seated on the upper surface of thewasher, a transverse pin in the plunger stem, the upper end of thehelical spring engaging the transverse pin, a cap having a throughopening in the top thereof threadedly engaging the threaded knockermember, the transverse pin engaging the under surface of the cap, thepin adapted to limit the upward movement of the plunger when returned toinitial position after being struck to produce a knock by the plungerengaging the upstanding portion in the bottom of the hollow cylindricalknocker member, and a knob on the upper end of the plunger stem adaptedto receive a blow in producing a knock.

JOI-1N STARP.

REFERENCES CITED The following references are of record in the le ofthis patent:

UNITED STATES PATENTS Number Name Date 212,316 McGill Feb. 13, 1879252,841 McGill Jan. 24, 1882 602,573 Coggeshall Apr. 19, 1898 2,046,868Burke July 7, 1936 FOREIGN PATENTS Number Country Date 388.961 FranceJune 15, 1908

